post on, post to
Information available online is posted on a website.
- The video is posted on the site, if you want to take a look at it.
But if you were posting a response as a reader of a website, then you would post your response to the website or in a chat room.
- How do I post a comment to your blog?
- Our word-filtering software checks all messages posted in the chat room.
Remember, however, that preposition use in English evolves. A look at examples on the Internet will confirm that usage for the verb post is still in flux, and often these prepositions are used interchangeably.
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